Elkhorn Hot Springs

Beaverhead County, Montana · Near Dillon
45.4580°N, 113.1090°W · 7,203 ft
118°F 7,203 ft Open Roadside US Forest Service Camping nearby (3.1 mi)
Aerial view of the ground around Elkhorn Hot Springs LiDAR bare-earth view of the same ground around Elkhorn Hot Springs
Aerial LiDAR bare earth

Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.

Elkhorn Hot Springs is a hot spring high in the Beaverhead National Forest, Beaverhead County, Montana, 28 miles from Dillon. Open access on Forest Service land. The source runs hot, above comfortable soaking. The water is strongly alkaline, with some iron. At over seven thousand feet, this is cold country; the yearly average temperature is in the mid thirties.

Location

Old Polaris Road runs past a little over a hundred feet away. Nearly nine feet of snow falls in an average winter, and snow on that road will decide when you can get in. Lupine Shelter is about three miles away for camping. The forest here is Beaverhead, and the designation is plain national forest, so this is public ground.

December to February is the listed window. Confirm Old Polaris Road is passable. The source temperature is above what most people will sit in, so whatever pool exists, if one does, needs to cool the water; nothing on file describes a pool. No fee recorded. The chemistry is from 1978.

Terrain

Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Elkhorn Hot Springs.

Setting
Hillside
The spring sits on a steep slope that climbs to the northwest.
Highest ground nearby
302 ft above the spring
Within a quarter mile, to the northwest
Cross-section through the spring

A slice through the ground from west to east, about 0.6 miles end to end.

Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.

Heat Below
102 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 50% of the springs on this site.

Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.

Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.

Monthly Climate
17°
Jan
18°
Feb
25°
Mar
31°
Apr
40°
May
49°
Jun
60°
Jul
60°
Aug
50°
Sep
36°
Oct
23°
Nov
15°
Dec
Annual Precip: 22.8 in Annual Snow: 106.2 in
Best Time to Visit
December Air 15°F · Water 118°F · +103° contrast
January Air 17°F · Water 118°F · +101° contrast
February Air 18°F · Water 118°F · +100° contrast
December offers 45°F more contrast than August
Current Conditions
Today 61° Low 34° Sunny
Spring is +57° warmer
Wednesday 64° Low 39° Sunny 11% precip
Spring is +54° warmer
Thursday 63° Low 41° Partly Sunny then Showers And Thunderstorms Likely 68% precip
Spring is +55° warmer
Friday 58° Low 36° Rain Showers Likely 63% precip
Spring is +60° warmer
Saturday 62° Low 38° Mostly Sunny then Chance Light Rain 25% precip
Spring is +56° warmer
Water Chemistry Sampled 1978-08-21

The water at Elkhorn Hot Springs is alkaline (pH 9.2).

pH 9.2 Alkaline
pH influences mineral absorption through skin
Calcium 2 mg/L
May support bone density and joint health
Magnesium 0 mg/L
Known for muscle relaxation and stress relief
Sodium 46 mg/L
Supports circulation and skin hydration
Sulfate 34 mg/L
Traditionally used for skin conditions and inflammation
Chloride 2 mg/L
Natural antiseptic with skin health benefits
Iron 200 µg/L
Iron-rich springs may support circulation
Nearby Camping
Nearby Camping
Lupine Shelter 3.1 mi away

Overview Lupine Shelter is a picnicking facility open year-round, however it is most heavily visited during the winter, when it is used by snowmobilers as a warming hut. It is an excellent location to have a picnic or a family gathering any time of year.Recreation In winter, snowmobiling, cross country skiing and snowshoeing are popular activities in the snow-covered meadow surrounding the shelter. During the spring, summer and fall, a variety of hiking and mountain biking trails can be foun...

Reservable Yes
Reserve on Recreation.gov →
Mile-High Advisory 7,203 ft

Elkhorn Hot Springs sits at 7,203 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 29% stronger than at sea level, so bring sunscreen and drink more water than you normally would.

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Temperature
118°F
Warm Hot Boiling
Water Temp 118°F (48°C)
Avg Air Temp 35°F
Above Ambient +83°F
Great soaking conditions September
Access
Open
Road Access Roadside
Nearest Road Old Polaris Road
Distance to Road 118 ft
Land
Ownership Federal
Agency US Forest Service
Designation National Forest
Unit Beaverhead National Forest
Manager US Forest Service
Protection 3 - Protected, subject to extractive use
Frequently Asked Questions
What is the water temperature at Elkhorn Hot Springs?
Elkhorn Hot Springs has a water temperature of 118°F (48°C). This is considered a hot spring, well above body temperature.
Where is Elkhorn Hot Springs located?
Elkhorn Hot Springs is located in Beaverhead County, Montana at 7,203 feet elevation, near Dillon. Coordinates: 45.4580°N, 113.1090°W.
How do I get to Elkhorn Hot Springs?
Elkhorn Hot Springs has Roadside road access, with the nearest road being Old Polaris Road (118 ft from the road).
Is Elkhorn Hot Springs free to visit?
Elkhorn Hot Springs has Open access. It is managed by US Forest Service.
Can I camp near Elkhorn Hot Springs?
Yes, Lupine Shelter is located nearby (3.1 miles away).
What minerals are in the water at Elkhorn Hot Springs?
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride, Iron. The pH is 9.2 (alkaline).
Is it safe to soak at Elkhorn Hot Springs?
With care. At 118°F Elkhorn Hot Springs is hot enough to need short sessions, fifteen to twenty minutes, and plenty of water. Enter slowly and get out if you feel light-headed.
Sources: USGS NWIS